I waited about 3 months. I registered end of June and received the first bill in Oct.

It doesn't delay our plans because we have no intention to move in yet.
Temporarily we are still monitoring the overall conditions of the house after saw so many negative reviews on houses by this developer. After we got the key, i went to check 3 times and didn't see anything bad.

Last i week i went to check the house again since it's raining season now. I observed the concrete slab car porch has some cracks in certain parts. So i am not sure is it because of that, the ceiling below has water stains and mold and it was quite bad. It's nearer to the open space area. Other than that, there are signs of internal pipe leaking on one of the wall in the master bedroom. The other side of the particular wall is our neighbour's bathroom. They already moved in.  I touched it and it was not wet or damp either. So i don't know what's the problem. The water pressure of all the toilets are low, shower area and WC has no water or after flush, there is no sounds of water flowing into the WC. I only turn on the water last week, so maybe the water storage tank is not full yet.

I have hired house inspector to do inspection this week. So we shall see what other defects the house has. Once we got the full report, then only we submitted in our defects form. So as per what other house owner's reviews, developer will take their own sweet time to repair or fix the problems. So we will wait and observe it again after the repairs.